Vhf/uhf self-tuning planar antenna system

• Main Authors: PRAPAN PAUL TINAPHONG, YI SHUI
• Format: Patent
• Language: English
• Published: 28.06.1999
• Edition: 6
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; BASIC ELECTRONIC CIRCUITRY; CONTROL OF AMPLIFICATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; SELECTING RESONANT CIRCUITS; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION; TUNING RESONANT CIRCUITS

An antenna tuning apparatus for VHF/UHF antenna comprises an automatic gain control (AGC) arrangement, including an amplifier, the gain of which is controlled by the AGC arrangement, and a plurality of impedance matching networks which are coupled between an antenna input of the tuning apparatus and the AGC-controlled amplifier. A remote controller is provided to select both channels of a television apparatus, for which the tuning apparatus provides VHF/UHF signals, and proper matching networks suitable for respective ones of selected channels simultaneously. Each one of the plurality of matching networks exclusively provides the AGC arrangement with a respective group of RF signals which includes a plurality of receivable broadcast channels. The gain of the amplifier is controlled in response to the level of the group of RF signals.